參數(shù)資料
型號(hào)： ICS84321AYIT
元件分類： 時(shí)鐘產(chǎn)生/分配
英文描述： 260 MHz, OTHER CLOCK GENERATOR, PQFP32
封裝： 7 X 7 MM, 1.40 MM HEIGHT, MS-026, LQFP-32
文件頁(yè)數(shù)： 16/16頁(yè)
文件大?。?/td> 303K
代理商： ICS84321AYIT
84321AYI
www.icst.com/products/hiperclocks.html
REV. A OCTOBER 10, 2003
9
Integrated
Circuit
Systems, Inc.
ICS84321I
260MHZ, CRYSTAL-TO-3.3V DIFFERENTIAL
LVPECL FREQUENCY SYNTHESIZER
V
CC - 2V
50
50
RTT
Z
o = 50
Z
o = 50
FOUT
FIN
RTT =
Z
o
1
(V
OH + VOL / VCC – 2) – 2
3.3V
125
125
84
84
Z
o = 50
Z
o = 50
FOUT
FIN
The clock layout topology shown below is a typical termina-
tion for LVPECL outputs. The two different layouts mentioned
are recommended only as guidelines.
FOUT and nFOUT are low impedance follower outputs that
generate ECL/LVPECL compatible outputs.Therefore, terminat-
ing resistors (DC current path to ground) or current sources
must be used for functionality. These outputs are designed to
FIGURE 2B. LVPECL OUTPUT TERMINATION
FIGURE 2A. LVPECL OUTPUT TERMINATION
drive 50
transmission lines. Matched impedance techniques
should be used to maximize operating frequency and minimize
signal distortion.
Figures 2A and 2B show two different layouts
which are recommended only as guidelines. Other suitable clock
layouts may exist and it would be recommended that the board
designers simulate to guarantee compatibility across all printed
circuit and clock component process variations.
TERMINATION FOR LVPECL OUTPUTS
APPLICATION INFORMATION
CRYSTAL INPUT INTERFACE
The ICS84321I has been characterized with 18pF parallel reso-
nant crystals.The capacitor values shown in
Figure 3 below were
determined using a 25MHz, 18pF parallel resonant crystal and
were chosen to minimize the ppm error. These same capacitor
values will tune any 18pF parallel resonant crystal over the fre-
quency range of 14MHz to 40MHz providing the other param-
eters specified in
Table 6, Crystal Characteristics, are satisfied.
Figure 3. CRYSTAL INPUt INTERFACE
ICS84321
XTAL2
XTAL1
C1
18p
C2
22p
X1
18pF Parallel Cry stal
相關(guān)PDF資料
PDF描述
ICS84321AYLFT 260 MHz, OTHER CLOCK GENERATOR, PQFP32
ICS843246AMIT 333.33 MHz, OTHER CLOCK GENERATOR, PDSO24
ICS843246AMLFT 333.33 MHz, OTHER CLOCK GENERATOR, PDSO24
ICS843246AGT 333.33 MHz, OTHER CLOCK GENERATOR, PDSO24
ICS843246AMLF 333.33 MHz, OTHER CLOCK GENERATOR, PDSO24
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
ICS84321AYLF 功能描述:IC SYNTHESIZER 260MHZ 32-LQFP RoHS:是 類別:集成電路 (IC) >> 時(shí)鐘/計(jì)時(shí) - 時(shí)鐘發(fā)生器，PLL，頻率合成器 系列:HiPerClockS™ 標(biāo)準(zhǔn)包裝:1,000 系列:- 類型:時(shí)鐘/頻率合成器，扇出分配 PLL:- 輸入:- 輸出:- 電路數(shù):- 比率 - 輸入:輸出:- 差分 - 輸入:輸出:- 頻率 - 最大:- 除法器/乘法器:- 電源電壓:- 工作溫度:- 安裝類型:表面貼裝 封裝/外殼:56-VFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:56-VFQFP-EP（8x8） 包裝:帶卷 (TR) 其它名稱:844S012AKI-01LFT
ICS84321AYLFT 功能描述:IC SYNTHESIZER 260MHZ 32-LQFP RoHS:是 類別:集成電路 (IC) >> 時(shí)鐘/計(jì)時(shí) - 時(shí)鐘發(fā)生器，PLL，頻率合成器 系列:HiPerClockS™ 標(biāo)準(zhǔn)包裝:1,000 系列:- 類型:時(shí)鐘/頻率合成器，扇出分配 PLL:- 輸入:- 輸出:- 電路數(shù):- 比率 - 輸入:輸出:- 差分 - 輸入:輸出:- 頻率 - 最大:- 除法器/乘法器:- 電源電壓:- 工作溫度:- 安裝類型:表面貼裝 封裝/外殼:56-VFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:56-VFQFP-EP（8x8） 包裝:帶卷 (TR) 其它名稱:844S012AKI-01LFT
ICS84321AYT 制造商:ICS 制造商全稱:ICS 功能描述:260MHZ, CRYSTAL-TO-3.3V DIFFERENTIAL LVPECL FREQUENCY SYNTHESIZER
ICS84321I 制造商:ICS 制造商全稱:ICS 功能描述:260MHZ, CRYSTAL-TO-3.3V DIFFERENTIAL LVPECL FREQUENCY SYNTHESIZER
ICS84324 制造商:ICS 制造商全稱:ICS 功能描述:CRYSTAL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER WITH FANOUT BUFFER
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